It's now possible to integrate FreeIPA/IDM (Red Hat) into vCenter Appliance (vCSA)/ vCenter Server for User authentications. We need to configure IPA server and vCenter Server for LDAP to authenticate users from IDM server. Follow this guide and you will up and running in no time with a fully working vCenter appliance/server with user authenticating from IPA Server. No need for Windows AD anymore :) .

For setting up centralized authentication through IPA we would need to configure 2 things.

IPA Server -- Create a SSO Usergroup for vCenter Server and add it as a hosts, create object class.

Now for the SSOGroup to work in vCenter its a requirement to run the below command. If you don't then the users in the SSO group wont be able to access and you need to add inidividual users for granting access to vCSA.